Going off my likely faulty memory, I recall that 5% may be related to the percentage of new nodes being selected vs vetted nodes, and not 5% more data. In other words, your odds of getting data increases if your node isn’t vetted.
Like BrightSilence mentioned, vetted and non-vetted are in two different pools, so in order for non-vetted to receive data a portion is included in the selection process of available nodes to receive data.
Keep in mind as well that nodes can lose the race to neighbors who are faster/closer to the uploader. So, if your node is faster it should gain more data than a slower node.